Control system for doubly-fed induction machine

A technology of doubly-fed induction and control system, applied in the field of doubly-fed machines, can solve the problems of low resonant frequency and no converter, and achieve the effect of easy implementation and high-efficiency damping

Active Publication Date: 2013-01-09
ABB (SCHWEIZ) AG
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this series compensation of the inductance has the disadvantage that the capacitor forms a resonant circuit with the inductance of the line and the supply network with a resonant frequency lower than the nominal frequency of the network (50 Hz or 60 Hz)
For this reason, it is not possible to operate the converter in this speed range if resonance exists in the network

Method used

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  • Control system for doubly-fed induction machine
  • Control system for doubly-fed induction machine
  • Control system for doubly-fed induction machine

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Embodiment Construction

[0019] figure 2 An example of a control system according to an embodiment of the invention together with a frequency converter for controlling a doubly-fed induction generator (DFIG) is shown. figure 2 The control system in is based on direct torque control. It was found that direct torque control tends to excite subsynchronous resonances already at moderately compensated levels of transmission line inductance.

[0020] An example of a conventional prior art direct torque controlled system is disclosed, for example, in US Patent 6,741,059. In a direct torque controlled system, such as that in the aforementioned US patent, machine torque and rotor flux linkage are the controlled variables. The actual values ​​of the torque and the rotor flux vector are estimated from the measured stator current vector, the measured rotor current vector and the stator flux vector. The stator flux vector is estimated by integrating the stator voltage vector.

[0021] exist figure 2 In , t...

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Abstract

A method and arrangement for controlling a doubly-fed induction machine by a frequency converter comprising a rotor side converter (INU) connected to a rotor circuit of a doubly-fed induction machine (DFIG) and having a control system with rotor flux as a feedback variable, a grid side converter (ISU) connected to an AC power network, and a direct voltage intermediate circuit (DC) connected between the rotor side converter (INU) and the grid side converter (ISU). The method comprises forming a rotor flux reference (psi r,re ), forming a damping signal (psi re ,D ), summing the damping signal and the rotor flux reference for obtaining a modified rotor flux reference (psi re ), and feeding the modified rotor flux reference to a controller of the rotor side converter (INU) for damping sub-synchronous resonances.

Description

technical field [0001] The present invention relates to doubly-fed machines and in particular to damping of sub-harmonic oscillations of alternating current (AC) power networks by control of doubly-fed machines. Background technique [0002] Doubly-fed induction machines are used in various generator and motor drives. One such motor drive comprising a converter is the doubly-fed slip ring generator configuration, the rotor circuit of which comprises two converters with a DC voltage intermediate circuit between them. One converter is situated electrically between the direct voltage intermediate circuit and the rotor, and the other converter is situated electrically between the direct voltage intermediate circuit and the grid to be supplied. [0003] Such doubly fed slip ring generators are commonly used in wind turbines. Sometimes many of these kinds of wind turbines are located in places where the connection to the grid requires long transmission lines. Long wires have co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P21/14
CPCH02P23/04H02P9/007B26D7/015B26F1/36B26F1/14B26F1/22B31D1/0043
Inventor 约科·尼拉宁斯拉沃米尔·塞曼雷约·弗塔嫩
Owner ABB (SCHWEIZ) AG
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